Running away to appear its accurate dimensions and the social depth of its reasons, the naturalismo dropped inevitably for the bonanza one, the isolated one, the extremity, the arbitrary one. (Idem, ibidem, P. 428). The bourgeois society enters in decay, at this moment the interest in explaining by means of science the effective society of the time appears. It is born thus, the Realism and soon later the Naturalismo, from 1865, in Portugal, due to ' ' Coimbr' question; ' ' ' Conferences of the Cassino' ' 3. Two schools exist aspects between these that must be considered, as it adds MOISS (2005: 191) In Portuguese literature, similar what it occurs in French Literature, it clearly seems the limit between the realistic and naturalistic romance, much even so has between them many and many points of contact, as it could not leave of being. The confusions in this land are born of not taking in account some important aspects.
The Naturalismo is, for many times, confused with the Realism due some similarities, however, as we will present here, it has some aspects that must be taken in account, rank that, is they who differentiate these literary moments. The naturalists, as well as the realists, are based on the theory of Taine, and accept that the work of art is conditional to the way, race and moment. But, the Naturalismo, in all the aspects goes beyond the Realism, and in agreement PROENA SON (2004: 243) ' ' … adding a clear and still more radically determinista vision to them of the behavior humano' '. The Naturalismo, in turn, is differentiated of the Realism, but it is not independent of this, therefore, that one starts, when this if intensifies, as it was a continuation, only that with more concretismo, the man is seen as product of natural forces.